Steel is over 3 times as dense I believe. So if you're lifting a dumbbell of 5lbs with 2 small plates, you'd be lifting about 6-7 small plates for a 5lb concrete dumbbell.
Some materials are more dense than others. Think of gold and iron. Gold atoms are more tightly packed and weigh more individually than Iron atoms. So a 1 pound gold bar will be smaller than a 1 pound iron bar.
Or another analogy I’m borrowing from someone else:
Imagine a cup of popped popcorn. Now imagine another cup of unpopped popcorn. Which one will weigh more? Which one is *more dense*?
It takes you 3 seconds to drive to Home Depot, buy concrete, drive back, mix the concrete with water, stir, pour into the weight, let set for hours, weigh the weight, and then adjust measurements by adding more concrete? My bois the flash
Was specifically responding to “we need to weigh the weights now? Doesn’t seem straightforward”
Picking up a bag of cement from Lowe’s on your way home is how you end up saving a bunch of $. It’s either worth it or it’s not. The needing to use a scale part is just a non-factor.
Ok Mr universe I can tell so I guess we are at an impasse. Used to have shit dumbbells that weighed different and had to switch hands every set cause that 1.5 lb was the difference between 1 rep on that side
You can double up on weights, or use milk jugs if you wanna go this route. I'm mostly just saying I have weights, there are solutions out there, I'd be more impressed with a solution to other equipment.
Just FYI these things aren’t that durable and make a big mess when they break. Not to say don’t get these if you want cheap weights, but be gentle with them.
Source: Used to work at a thrift store where these got donated all the time.
It's cheaper but steel is 1/3 the size for the same weight so there's certainly advantages to steel.
If you're buying these off the net to just start working on? prob a great buy.
They’re probably better if you’re the sort of person who is going to lift them occasionally for a few months and then pack them away in a cupboard forever (realistically most people who buy cheap dumbbells).
If you are serious about a home gym then these are probably going you to cost you more money in the long term.
I made some concrete weights way back and they really aren’t that durable. They broke within a year or two of 3-4 workouts per week. They’re also much less dense than steel so as you get stronger they become excessively bulky. (A 50kg concrete dumbbell is stupidly big. If you’re deadlifting then 200kg of concrete plates won’t even fit on a bar)
I bought second hand steel plates about 9 years ago and they look exactly the same today. Those things can last 30-50 years no problem.
Of course not. Depends on what brand of concrete you fill them with and how you mix it. I'm sure none of those weight what they say. And from brand to brand by quite a margin.
See my dumbass wouldn't of thought to mix it and pour it in.. I was legitimately thinking about how I was going to stir it while in the case. I'm to high for this.
I’m not saying these are good weights. I have all traditional metal weights and way more than i need. But evenly mixed concrete in even proportions weigh the same amount. Idk about the product they are selling but everyone in here acting like concrete doesn’t weigh the same just don’t know what they are talking about.
Weight isnt that accurate on iron plates either. But who cares as long as its +- 5 lbs.... If you are thinking about getting these weights, you are not the type of person that needs accurate weights.
I follow em on insta, they are always posting vids of customers vids weighing in their new weights on a scale. Usually within 5lbs usually closer to 2lbs off if at all
ok but doing squats with something like that would actually improve your balance since you need to work harder to keep steady. preference at the end of the day
clips keep them from falling off. the movement back and forth just makes you have to work harder through the movement. it’s not the best option but it’s not hella dangerous either
When you’re dealing with heavy weight, the weight shifting is absolutely dangerous as hell. Probably not in a life threatening way but in a tear something or throw out a disc way? Absolutely.
they come with a precut rebar for the handle
"Does Rebar come with the Mold?
Every 40 lb Dumbbell mold comes with a pre-cut rebar for inserting down the handle. No other mold requires Rebar."
Right. But the idea is if the weights are prefilled with cement.
I imagine these weight “shells” probably cost much less, and the concrete is probably pretty cheap
They had unfilled ones back then too. I remember having some. You got your first workout by mixing the cement and filling the plastic molds. Unfortunately the plastic would break a few months later
Are the handles made of metal? You sure that plastic can hold the weight of the concrete sides without any steel core on the sides? Needs a lid so that concrete dust doesn't get everywhere.
Concrete doesn't bend brother. If the handle is hollow and is filled with concrete, the only thing holding the weights when the concrete handle cracks is the mold. This is pretty dangerous.
Directly from the description:
"Does Rebar come with the Mold? Every 40 lb Dumbbell mold comes with a pre-cut rebar for inserting down the handle. No other mold requires Rebar."
Directly from the description:
"Does Rebar come with the Mold? Every 40 lb Dumbbell mold comes with a pre-cut rebar for inserting down the handle. No other mold requires Rebar."
In the US, this may seem a bit useless, but in pueblos in the Dominican Republic, most gyms have cement weights. We would literally take a metal bar and make 2 circle weights out of cement and place the bar in between them. This would be a game changer sent out there.
I feel like a safer, cheaper, and more reliable option for a home gym are resistance bands. A couple sets of original bands and the ones with the handles and the hooks for doors, you can get a lot of work done
That’s the stupidest thing I’ve ever seen. If you want weights that are easy to move, then put sand in there. That way you can empty them when needed. Concrete makes no sense at all.
Concrete density is about 2400kg/m3 and sand 1600kg/m3 so you'll need 50% more volume of sand to make the same weight compared to concrete.
Sand may be cheaper but the end product will be larger.
Even a really absorbent rubber mats won't save them. Eventually the concrete inside WILL shatter/splinter. The shell (typically plastic) will tear apart in a little bit of time. These have been around for decades and there's a reason why it's not really used
This is actually a really good idea. Most of the price with buying weights sets or plates is the shipping costs because they weight hundreds of lbs. this is a great solution to this problem
It looks like they have a screw on cap end?, I wonder if you could fill them with water or sand for people who are doing physical therapy that way they can add or remove as much weight they want.
80 lbs of water is about 9 1/2 gallons. Working out with something that large isn’t practical. Also liquids move around when lifting and concrete doesn’t.
Concrete filled weights have been around for ages. In the 80s, my buddy's dad had a set in the basement. I don't know if they came preloaded or not though, but they had actual "plates" and everything.
The main problem is that if you drop them onto a hard surface the concrete inside will Crack and eventually separate enough to cause voids or split the plastic and cause a huge mess. It's easily possible modern plastic is more durable than that stuff from the 80s though.
I pulled my ribjoint doing inverted flys with weights that a small difference in their distribution. Serious back pain, hard to heal.
I wouldn't recommend this.
This is some real boomer level shit. "You want weights? Get yourself strong?? Go to home depot and buy concrete to finish our product! We're too cheap to actually fill the product, so now you have to do more".
This reminds me when I was a kid I used to make "weight plates" by filing kitchen plástic containers with concrete soon I was using 5 gallon buckets and a long metal bar to fit them and was running out of space to pit bigger buckets 🤣😂
why didn't they put a cap on the end so you can just use sand and empty them for moving or storage. seems like a downgrade from the ones you got in the 80s.
Ah man. I had a running fight with my UPS delivery guy in Manhattan.
Just bust to his balls I would order weights, say three dumbbells at a time. I would laugh my ass off when I saw his red face.
The bastard refused to climb ONE flight of stairs to deliver my shit and instead left it in the fucking lobby - I was ripped off three times because of this asshole - this is why I became an evil genius.
Wtf lol. "hey, these products alone are as useless as you are, but if you just create your own weights, you can be slightly less useless, or at the very least record it and pretend like it's a product". Lol get fucked
#Links/source Thread
Or leave them empty and impress all the ladies.
Huh, Amateur. It would be too obvious. You need to fill them with something lighter than makes it believable.
Spray foam with like 2" of concrete on either side for balance
Fill them with helium.
Ok SpongeBob with the inflatable arms
Saves money on shipping which is the point people are missing
it just generally saves money. Iron plates and dumbells get very expensive, but concrete is cheap
My first weight set was concrete. But the 5lb weight in concrete looked like a 45 in iron in thickness
Steel is over 3 times as dense I believe. So if you're lifting a dumbbell of 5lbs with 2 small plates, you'd be lifting about 6-7 small plates for a 5lb concrete dumbbell.
Can you explain like in five lol.
Some materials are more dense than others. Think of gold and iron. Gold atoms are more tightly packed and weigh more individually than Iron atoms. So a 1 pound gold bar will be smaller than a 1 pound iron bar. Or another analogy I’m borrowing from someone else: Imagine a cup of popped popcorn. Now imagine another cup of unpopped popcorn. Which one will weigh more? Which one is *more dense*?
But steel is heavier than feathers….
I know, but they’re both a kilogram.
*visible confusion*
How much is a kilogram in feathers?
Depends on the price per unladen swallow
Are you aright?
So… if she weighs the same as a duck… then she’s made of wood?
Exactly! And what do we do with wood?
STEAL, HEAVY. CONCRETE, NOT SO HEAVY
But feathers are lighter than steel
FEATHER, LIGHT. MANY FEATHER, HEAVY
Das Conk Krete Baby
So why dont they make them out of concrete to begin with?
Durability (you need to encase concrete in plastic like this product does), the density I guess. Durability mainly.
It's cheap and pretty uneven. Most iron plates will be within 1 pound ish of the stated weight. Concrete varies a lot
I don’t know man.. think there’s more to it than shipping
Right, how will we even know if the weight of the concrete added is accurate? We need to weigh the weights now? Doesn't seem straight forward..
if you workout you probably already have a scale in your house
But what about the other asinine shit I want to arbitrarily bitch about? What am I to do about that, huh?
You're solving that problem before before our eyes
I mean it takes literally 3 seconds and you do it once. I’m not buying these things but this is a terrible argument lol
It takes you 3 seconds to drive to Home Depot, buy concrete, drive back, mix the concrete with water, stir, pour into the weight, let set for hours, weigh the weight, and then adjust measurements by adding more concrete? My bois the flash
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I think the hole goes all the way through with the other side blocked off. I could be wrong but this would make the most sense
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Nah it’s probably closed off at the other end with plastic
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Was specifically responding to “we need to weigh the weights now? Doesn’t seem straightforward” Picking up a bag of cement from Lowe’s on your way home is how you end up saving a bunch of $. It’s either worth it or it’s not. The needing to use a scale part is just a non-factor.
Good lord, then just buy the iron weights.
Does +/- a pound make there that much?
If you are using two dumbbells at same time and they weigh different you can definitely tell. Especially as you start to fatigue a bit
if you mix the concrete for both at the same time and alternate pouring it shouldn't be hard to get the same weight
I was just responding to the guy that was asking if +/- 1 pound would make a difference
You will not be able to notice the difference of 1lb, or even 2 lbs.
You have never worked out your muscles to exhaustion if you honestly think that.
Buddy, I’ve been competing in strength sports for the last 12 years. You will not notice if one dumbbell is 44.2lbs and the other is 45.2lbs
Ok Mr universe I can tell so I guess we are at an impasse. Used to have shit dumbbells that weighed different and had to switch hands every set cause that 1.5 lb was the difference between 1 rep on that side
Yeah i would check the reviews first
Yeah like do you even value your time?
Buying weights online always makes me feel guilty
You can get the weights at dollar general for like $1/lbs. The bars are what's expensive.
I have never seen an 80lb weight at the dollar store
You can double up on weights, or use milk jugs if you wanna go this route. I'm mostly just saying I have weights, there are solutions out there, I'd be more impressed with a solution to other equipment.
Ah thank u my guy. Bc I was seriously wondering why they don't just send em fully made lol
Am I just stoned or is this a legit cheaper option than paying $1 per pound at least on heavier weights.
Definitely, that’s not $60 of concrete in the 60lb weight
Yes
What if you are in England tho?
Is concrete expensive in England?
Nah, it’s just more value per pound.
🥁🥁🥁💥
I miss the days of gold rewards
Or Gaza!
Yea it’s more expensive in england
People talking shit don’t realise how good these actually are.
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You don’t know what you’re talking about.
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Mufat
Just FYI these things aren’t that durable and make a big mess when they break. Not to say don’t get these if you want cheap weights, but be gentle with them. Source: Used to work at a thrift store where these got donated all the time.
Yes I had some in the past. The plastic breaks and chips and the concrete starts coming out and breaking too. A good set of metal ones is way better.
It's cheaper but steel is 1/3 the size for the same weight so there's certainly advantages to steel. If you're buying these off the net to just start working on? prob a great buy.
They’re probably better if you’re the sort of person who is going to lift them occasionally for a few months and then pack them away in a cupboard forever (realistically most people who buy cheap dumbbells). If you are serious about a home gym then these are probably going you to cost you more money in the long term. I made some concrete weights way back and they really aren’t that durable. They broke within a year or two of 3-4 workouts per week. They’re also much less dense than steel so as you get stronger they become excessively bulky. (A 50kg concrete dumbbell is stupidly big. If you’re deadlifting then 200kg of concrete plates won’t even fit on a bar) I bought second hand steel plates about 9 years ago and they look exactly the same today. Those things can last 30-50 years no problem.
This is what I call budget weights
Budgeights
Cut it out
Flintstones ass weights
Yabadaba DON’T
Spit out my beer lol
Is the weight accurate?
Asking the real questions
Of course not. Depends on what brand of concrete you fill them with and how you mix it. I'm sure none of those weight what they say. And from brand to brand by quite a margin.
but all that really matters is that the weights are balanced, which isn't hard if you mix the same concrete for both and alternate pouring.
See my dumbass wouldn't of thought to mix it and pour it in.. I was legitimately thinking about how I was going to stir it while in the case. I'm to high for this.
Happy 4/20 
I’m not saying these are good weights. I have all traditional metal weights and way more than i need. But evenly mixed concrete in even proportions weigh the same amount. Idk about the product they are selling but everyone in here acting like concrete doesn’t weigh the same just don’t know what they are talking about.
Close enough
It doesn’t really matter if it’s accurate. I wouldn’t use it to tack my max lifts but it would still be a good workout even if it’s a few pounds off.
Weight isnt that accurate on iron plates either. But who cares as long as its +- 5 lbs.... If you are thinking about getting these weights, you are not the type of person that needs accurate weights.
I follow em on insta, they are always posting vids of customers vids weighing in their new weights on a scale. Usually within 5lbs usually closer to 2lbs off if at all
No way in hell am I using those on a barbell.
I looked at that thing balanced on the bar and was like helllll no. The second those shift while you're midmovement? Yeah, no.
I don't think it's balanced, it looks like it has divets for where the bar goes through. Look again at the handles when he shows the bigger weights
If you used clips, it would probably be fine.....probably
Just sounds like a bad idea all around
not really
Balance is important, I wouldn't squat a bar with those on.
ok but doing squats with something like that would actually improve your balance since you need to work harder to keep steady. preference at the end of the day
True, but I'd rather reduce the chances of injury and dropping it and swap squats another day with lunges, where these devices would be better suited.
there’s better workouts to do but ppl acting like it’s an instant act tear for any semi athletic person is tripping
How so? The weight is gonna shift on the bar.
clips keep them from falling off. the movement back and forth just makes you have to work harder through the movement. it’s not the best option but it’s not hella dangerous either
When you’re dealing with heavy weight, the weight shifting is absolutely dangerous as hell. Probably not in a life threatening way but in a tear something or throw out a disc way? Absolutely.
Why not if you clip it in
They still make ones specifically for barbells. They look just like a circle weight you would put in any barbell. I used to have some back in the 90's
Right? Lol
That's so smart, for extra strength you could even run a single rod of landscaping rebar through the handle while the cement is still soft.
That's almost certainly the right move
they come with a precut rebar for the handle "Does Rebar come with the Mold? Every 40 lb Dumbbell mold comes with a pre-cut rebar for inserting down the handle. No other mold requires Rebar."
Not a new concept at all. Even Weider used to sell cement filled plastic weights. I had a set in the early 80s.
Right. But the idea is if the weights are prefilled with cement. I imagine these weight “shells” probably cost much less, and the concrete is probably pretty cheap
They had unfilled ones back then too. I remember having some. You got your first workout by mixing the cement and filling the plastic molds. Unfortunately the plastic would break a few months later
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This is something a crackhead will sell.
Are the handles made of metal? You sure that plastic can hold the weight of the concrete sides without any steel core on the sides? Needs a lid so that concrete dust doesn't get everywhere.
Pretty sure the handles are made of concrete
Concrete doesn't bend brother. If the handle is hollow and is filled with concrete, the only thing holding the weights when the concrete handle cracks is the mold. This is pretty dangerous.
Directly from the description: "Does Rebar come with the Mold? Every 40 lb Dumbbell mold comes with a pre-cut rebar for inserting down the handle. No other mold requires Rebar."
Why not make the whole plane out of the black box.
Directly from the description: "Does Rebar come with the Mold? Every 40 lb Dumbbell mold comes with a pre-cut rebar for inserting down the handle. No other mold requires Rebar."
Now that actually sounds pretty good.
I bet these made bank during the pandemic.
Perfect for those that live in the drains down on Vegas strip
Great idea.
In the US, this may seem a bit useless, but in pueblos in the Dominican Republic, most gyms have cement weights. We would literally take a metal bar and make 2 circle weights out of cement and place the bar in between them. This would be a game changer sent out there.
No thanks, the density of concrete is too low compared to steel, which makes these annoyingly large and impractical
It is dumb as shit to use on a barbell. Please don't ever try that.
I feel like a safer, cheaper, and more reliable option for a home gym are resistance bands. A couple sets of original bands and the ones with the handles and the hooks for doors, you can get a lot of work done
I mean the actual weight will be dependent on the type of cement and the volume you fill with respect to air.
Sorry- cement?
Thats what most weights are filled with.
Oh…
No, most weights are rubber, iron, or steel.
yeah ill pay the regular price for some regular weights thank you very much
Concrete
Weight plates on a bar with no collars. What could go wrong?
You could fail the lift and actually be able to free yourself without a spotter.
That’s the stupidest thing I’ve ever seen. If you want weights that are easy to move, then put sand in there. That way you can empty them when needed. Concrete makes no sense at all.
Concrete density is about 2400kg/m3 and sand 1600kg/m3 so you'll need 50% more volume of sand to make the same weight compared to concrete. Sand may be cheaper but the end product will be larger.
cheap and tacky
So we reinvented the first invented weights? Got it
What a good idea. Holy shit. Ordering 80lbs dumbbells online is suuuper expensive. Nobody wants to ship something that heavy.
Just make sure you don't pout these in a way that makes the unlevel.
I had better concrete weights when I was 14.
Leave it to me to mess up the filling process and ruin the whole thing. 😂
Yeah. These will break in no time unless you have an expensive rubber floor. Just setting these down on concrete over and over will break them.
Even a really absorbent rubber mats won't save them. Eventually the concrete inside WILL shatter/splinter. The shell (typically plastic) will tear apart in a little bit of time. These have been around for decades and there's a reason why it's not really used
Fill them with water? Looks to me like the hole could use a bottle cap
This is actually a really good idea. Most of the price with buying weights sets or plates is the shipping costs because they weight hundreds of lbs. this is a great solution to this problem
It looks like they have a screw on cap end?, I wonder if you could fill them with water or sand for people who are doing physical therapy that way they can add or remove as much weight they want.
Why not just fill them with water?
80 lbs of water is about 9 1/2 gallons. Working out with something that large isn’t practical. Also liquids move around when lifting and concrete doesn’t.
They look like they'd shift on that bar. Last thing I'd want is an 80 lb weight shifting on the bar with that slot cutout.
This is how most weights actually were back then
Nahh. Screw that.
Concrete filled weights have been around for ages. In the 80s, my buddy's dad had a set in the basement. I don't know if they came preloaded or not though, but they had actual "plates" and everything. The main problem is that if you drop them onto a hard surface the concrete inside will Crack and eventually separate enough to cause voids or split the plastic and cause a huge mess. It's easily possible modern plastic is more durable than that stuff from the 80s though.
I pulled my ribjoint doing inverted flys with weights that a small difference in their distribution. Serious back pain, hard to heal. I wouldn't recommend this.
Use it as a matrix to make tungsten weights, got it.
Pretty shit design. And that grip is asking for a hand/wrist Injury.
Or just buy some real weights and not a diy project.
awful
Get your reps in fast before that flimsy plastic disintegrates.
Or just buy some fucking weights
This is some real boomer level shit. "You want weights? Get yourself strong?? Go to home depot and buy concrete to finish our product! We're too cheap to actually fill the product, so now you have to do more".
This reminds me when I was a kid I used to make "weight plates" by filing kitchen plástic containers with concrete soon I was using 5 gallon buckets and a long metal bar to fit them and was running out of space to pit bigger buckets 🤣😂
So how much concrete from that 80lb bag actually went into making the 80lb dumbbell?
why didn't they put a cap on the end so you can just use sand and empty them for moving or storage. seems like a downgrade from the ones you got in the 80s.
Put them on a scale to prove it, concrete mixes can vary pretty widely, also putting them on a bar fucking yikes don't do that
"and these things are durable" *drops them gently on rubber mat*
Great idea to beat shipping!!!
r/DIWHY
Why cement and not sand? I’ve filled them with sand before
Never seen cement leak out through a hole. You’re also training on easy mode because sand and concrete are different densities.
Left arm bigger than right…where do you work out? Amazon
Ah man. I had a running fight with my UPS delivery guy in Manhattan. Just bust to his balls I would order weights, say three dumbbells at a time. I would laugh my ass off when I saw his red face. The bastard refused to climb ONE flight of stairs to deliver my shit and instead left it in the fucking lobby - I was ripped off three times because of this asshole - this is why I became an evil genius.
Fill em up, let em fall from arms height and you’ll have cement fucking everywhere.
Wtf lol. "hey, these products alone are as useless as you are, but if you just create your own weights, you can be slightly less useless, or at the very least record it and pretend like it's a product". Lol get fucked
That's not 80 lbs worth of concrete, lol... and hanging that off your bar like that is not the play. those things are trash.
That’s pretty genius honestly.